The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 18, 2012
Filed:
Dec. 22, 2009
Naruhisa Nagata, Nagano, JP;
Ryoji Kobayashi, Nagano, JP;
Masaki Miyazato, Nagano, JP;
Fuji Electric Co., Ltd., , JP;
Abstract
A method of forming a protective film for a magnetic recording medium is disclosed. The protective film suppresses cobalt elution out of the magnetic recording layer and has a thickness not larger than 3 nm. The method of the invention of forming a protective film for a magnetic recording medium comprises (1) a step of forming a protective film, on a lamination including a substrate and metallic film layers formed on the substrate, by means of a plasma CVD method using a raw gas of a hydrocarbon gas, wherein a flow rate of the hydrocarbon gas is in a range of 50 sccm to 200 sccm and a emission current is in a range of 0.1 A to 0.3 A, and (2) a step of surface treatment on the protective film that has been formed in the step (1), including sub-steps of (2a) a plasma treatment in an argon gas and (2b) a plasma treatment in a gas containing a nitrogen gas.